For example if the customer has a mortgage of
£130,000 and has £10,000 in a linked account and current
account, by offsetting they will only be charged mortgage interest on the
£120,000 difference. If they decide to overpay each month, they can do so
without incurring early repayment charges, by making the contractual monthly
payment.

The interest saved by subtracting the
account balance from the mortgage balance will over time reduce the mortgage
balance and therefore the term of the mortgage or your client can pay each
month.

To save even more interest your client can also make
overpayments on their mortgage at any time if it suits them.

In addition because the checking and savings account are
not earning interest, tax will not be relevant on the savings, which can be
particularly efficient for a higher-rate-payer.